We gave our son his royal bumps for his fifth birthday.
royal bumps
idiomA ritual of two or more persons holding another person by the arms and legs, face up, while bumping them repeatedly on the floor. In modern times it is a lighthearted affair, generally performed only on a young person's birthday with the number of bumps corresponding to the person's age in years. Historically it was a hazing.
The children gathered around their friend to give him his royal bumps as part of the birthday tradition.
Following the long-standing custom, the students hoisted their classmate into the air to administer the traditional royal bumps for his eighteenth birthday.